Lead-lined boiler for paper-pulp



(No Model.)

J. MAKIN.

LEAD LINED BOILER FOR PAPER PULP.

No. 344,120. Patented June 22, 1886.

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UNHED TATES JOHN MAKIN, OFv BELFIELD, NEAR ROOHDALE, COUNTY OF LANCASTER,

ENGLAND, ASSIGNOR TO CHARLES C.

MOUTH, MAINE.

SPRINGER, TRUSTEE, OF YAR- LEAD-LINED BOILER FOR PAPER-=PULP.

SPECIFICATION forming part of Letters Patent No. 344,120, dated June 22, 1886.

Application men April 27, L886.

To all whom it may concern.-

Be it known that I, JOHN MAKIN, of Belfield, near Rochdale, in the county of Lancaster, England, manager of a paper-works, have invented an Improvementin Lead-Lined Boilers for Paper-Pulp, of which the following de scription, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

In the manufacture of paper-pulp from wood by the so-called sulphite process it is nec essary to provide the boiler with a lining, coated or covered at its inner side with lead or other usual acid-resisting metal.

Patent of the United States No. 335,943, dated February 9, 1886, shows and describes a compound lining consisting of a foundationplate, preferably of iron, covered on both sides with lead, the lead being caused to adhere to the foundation-plate by casting.

In practice it has been found that sheet-lead forms the most serviceable face; but great difficulty has been experienced in securing the sheet-lead to the foundationplate.

In my experiments to employ sheet-lead I have discovered that the same may be firmly secured or anchored to the foundation-plate by means of solder dropped into the holes made in the plate, the said solder attaching itself to the lead opposite the said holes, the said lead being partially melted opposite the holes be fore the introduction of the solder.

My invention therefore consists in a novel method of attaching sheet-lead to a foundation-plate in the manufacture of a compound lining for pulp-forming boilers.

My invention consists, essentially, in placing the foundation-plate and sheet-lead in contact, then partially fusing the lead opposite the holes in the foundation-plate, and running molten solder into the said holes to unite them with the partially-fused portion of the sheetlead, the said solder filling the said holes and attaching itself firmly to the sheet-lead, constituting a series of bolts or anchors to holdthe sheet-lead in place on thefoundation-plate and prevent it from creeping. The term creeping is fully explained in said patent.

Figure 1 represents a piece of lead lining Serial No. 200,312. (No model.)

suitable to be applied to a boiler, shell, or tank for the production of wood or other fibrous pulp by a process wherein acid is employed; and Fig. 2 is a section of Fig. 1 in the dotted line a m, the said figure also showing a small portion of the boiler.

The boiler or other vessel (1, a portion of which is shown in Fig. 2, is or may be of any usual shape commonly employed in the manu facture of wood pulp.

The compound lining is composed, essentially, of a foundation-plate, I), having a series of holes, I), and preferably the entire surface of the foundation-plate will be covered with tin or zinc by a dipping or galvanizing pro cess, in order that the lead or solder brought in contact therewith may more readily adhere thereto.

In the drawings 1 have represented the tin ning or galvanizing by the letter 9; but the thickness of the tinning or galvanizing is eX- aggerated.

The sheet-lead, i, to be used will in practice be about threeeighths of an inch thick, more or less. The foundation plate, preferably tinned or galvanized, will be laid upon the sheet-lead Z.

As herein sh own,it is supposed that the compound lining is to have a straight side; but the compound lining may be made to present any curve by first bending the foundation-plate to the proper curve and by employing a templet of the proper curve, upon which thesheetlead will be laid, the curved foundation-plate being thereafter laid upon the sheet-lead.

Assuming that the foundation plate and sheet-lead have been placed in contact, the operator by means of-a blow-pipe will blow the flame into the holes I) and partially melt that part of the sheet-lead opposite the lower end of the holes, and while the same I is yet in molten state will fill the said hole with molten solder, which will combine with the molten lead, constituting, as it were, a solder rivet integral with the lead lining.

Sheet-lead Z, anchored, as described, at frequent intervals by means of solder, bolts, or rivets d,will be found to be so firmly attached to the foundation plate that the lead will not By the term solder I mean any usual fusible solder mixture.

'1 claim- An improvement in the art or method of manufacturing compound linings for boilers, which consists in placing the sheet-lead and perforated foundation-plate together, partially fusing thelead opposite the holes in the foundation-plate, and filling in the said holes with solder, the solder attaching itself to the sheet- 20 lead and holding the same in place upon the foundation-plate, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

J OHN MAKIN.

\Vitnesses ALFRED GRUNDY,

104: King Street, Manchester, England, Solicitor.

WM. T. J ONES, 104 King Street, Manchester, England, Solieitors Clerk. 7 

